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In this paper, a multi-physics torque simulation of the nonmagnetic rotor submerged in ferrofluid is proposed. It is noted that there is no exerted magnetic force on the nonmagnetic materials. After calculation of magnetic force densities in ferrofluid, the pressures acting on the surface of rotor can be acquired from hydrostatics. Then torque is calculated from the surface pressures of rotor. A simple...
Recently, integrated motor propulsors (IMPs) have been under extensive research and development because of the numerous advantages of underwater propulsion for vehicles, such as a simple, quiet, lightweight, and small-size structure [1]. IMPs require minimized torque ripple for smooth and quiet operation when used in undersea vehicles or unmanned submarines. Thus, torque ripple reduction should be...
This paper presents fault detection and its analysis for permanent magnet assisted synchronous reluctance motor (PMa-SynRM). The PMa-SynRM has been increasingly studied for critical service application where high efficiency and reliability is required in industry. However, the research on the fault in a PMa-SynRM has been limitedly studied, and no study on the eccentricity fault diagnosis for multiphase...
An adaptive speed controller is proposed for a permanent magnet synchronous motor (PMSM). The proposed adaptive speed regulator is insensitive to model parameter and load torque variations because it does not need any accurate knowledge about the motor parameter and load torque values. The stability of the proposed control system is also proven. Simulation and experimental results are presented to...
Indirect field oriented control (IFOC) and direct torque control (DTC) have been widely commercialized in induction motor drives, with each being favored by its supporters. In this paper, the dynamic performance of these drives for an electric vehicle application is examined, and sensitivities to parameter variations affecting this dynamic performance are explored. Key performance measures include...
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